Differential Pressure Control Valve Passim · (DPCV) DN 15 - 50 1/2 - 2” Nexus Valve Passim Differential Pressure Control Valve (DPCV) DN 65 - 80 2½ - 3” 2.1 Description DN 15-80

Differential Pressure Control Valve Passim

FelixP

Climate control

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Table of contents

Chapter Nexus Valve Passim DN 15-50, DN 65-80

1. Safety instructions 41.1 Rules/regulations 41.2 Intended use 51.3 Initial operation 51.4 Working on the system 51.5 Liability 5

2. Introduction 62.1 Description 62.2 Benefits 72.3 Design 82.4 Pressure balancing 102.5 With partner valve 122.6 Mounting 142.7 Operation 16

3. Applications 18

4. Product data sheet 254.1 Product finder 254.2 Nexus Valve Passim DN 15-50, DN 65-80 284.2.1 Passim DN 15-32 female/female with drain 284.2.2 Passim DN 40 female/female with drain Passim 304.2.3 Passim DN 50 female/female with drain 324.2.4 Passim DN 15-32 female/female without drain 344.2.5 Passim DN 15 male/male without drain 364.2.6 Passim DN 65-80 flange/flange 374.3 Flow diagrams 384.4 Valve sizing 464.5 Valve setting 55

5. Accessoires 64

6. Sizing examples 666.1 DN 15-50 666.1.1 System with Nexus Valve Passim and Nexus Valve Fluctus 666.1.2 System with Nexus Valve Passim and Nexus Valve Vertex 686.2 DN 65-80 706.2.1 System with Nexus Valve Passim and Nexus Valve Fluctus 706.3 General specifications DN 15-50 726.4 General specifications DN 65-100 73

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Please read the instructions carefully before installationThe installation and initial operation of the assembly may be carried out only by an authorised specialist company.Prior to starting work, familiarise yourself with all parts and how they are handled.The application examples in these operating instructions are ideas sketched out. Local laws and regulations have to be observed.

Target group:These instructions are intended for authorised specialists exclusively. Work on the heating system, the potable water as well as gas and power network may be carried out by specialists only.

Please follow these safety instructions carefully in order to avoid hazards and damage to people and property.

1.1 Rules/regulations

Please observe the applicable accident prevention regulations, the environmental legislation and the legal rules for mounting, installation and operation. Moreover, please observe the appropriate guidelines of German standard DIN, EN, DVGW, VDI and VDE (including lightning protection) as well as all current relevant country-specific standards, laws and regulations. Old and newly enforced regulations and standards shall apply, if they are relevant for the indivi-dual case. Moreover, the regulations of your local energy supply company have to be observed.

Electrical connection:Electrical wiring work may be carried out by qualified electricians only. The VDE regulations and the specifi-cations of the relevant energy supply company have to be met.

Excerpt:Installation and construction of heat generators as well as the drinking water heaters:DIN EN 4753, Part 1: Water heater and water heating plants for potable and process water.DIN EN 12828 Heating systems in buildings.DIN 18 421: Insulation work on technical plantsAV B Wa s V Regulations concerning the general conditions for the supply with waterDIN EN 806 ff.: Technical rules for potable water installationDIN 1988 ff.: Technical rules for potable water installation (national addition)DIN EN 1717: Protection of potable water against contaminationsDIN 4751: Safety equipment

Electrical connection:VDE 0100: Erection of electrical equipment, grounding, protective conductor, potential equalisation conductor.VDE 0701: Repair, modification and testing of electrical devices.VDE 0185: General aspects on the erection of lightning protection systems.VDE 0190: Main potential equalisation of electrical plants.VDE 0855: Installation of antenna plants (shall apply mutatis mutandis).

1. Safety instructions

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Additional remarks:VDI 6002 Sheet 1: General principles, system technology and use in house buildingVDI 6002, Sheet 2: Use in students’ hostels, retirement homes, hospitals, indoor swimming pools and on camping facilities

Caution:Prior to any electrical wiring work on pumps and controls, these modules have to be disconnected from voltage correctly.

1.2 Intended use

Inexpert installation as well as use for a purpose not intended of the assembly shall rule out all warranty claims.All shut-off valves may be closed by an approved specialist only in case of servicing as otherwise the safety valves are not effective.

Do not modify the electrical components, the construction or the hydraulic components! You will impair the safe function of the plant otherwise.

1.3 Initial operation

Prior to the initial operation, the plant has to be tested for tightness, correct hydraulic connection as well as accurate and correct electrical connection. In addition, the plant has to be flushed correctly and/as required in keeping with German standard DIN 4753. The initial operation has to be carried out by a trained specialist, which has to be recor-ded in writing. In addition, the settings have to be put down in writing. The technical documentation has to be available at the device.

1.4 Working on the system

The plant has to be de-energised and to be checked for the absence of voltage (such as on the separate fuse or a master switch). Secure the plant against unintentional restart.(If gas is used as fuel, close the gas shut-off valve and secure against unintentional opening.) Repair work on compo-nent parts with a safety-relevant function is impermissible.

1.5 Liability

We reserve all copyrights for this document. Wrongful use, in particular reproduction and forwarding to third parties shall not be permitted.These installation and operating instructions shall have to be handed to the customer. The executing and/or autho-rised tradesperson (such as fitter) shall have to explain the function and operation of the plant to the customer in an intelligible manner.

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Nexus Valve Passim

Differential Pressure Control Valve (DPCV)

DN 15 - 501/2 - 2”

Nexus Valve Passim

Differential Pressure Control Valve (DPCV)

DN 65 - 802½ - 3”

2.1 Description

DN 15-80The Nexus Valve Passim is a differential pressure control valve used in hydronic heating or cooling systems. By ensuring a constant differential pressure across motorized or static balancing valves, the Nexus Valve Passim valve provides the conditions necessary to achieve the desired flow distribution in a system. The Nexus Valve Passim valve eliminates also noise nuisance caused by high differential pressure across radiator thermostats, two-way control valves or other components in a system.

2. Introduction

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2.2 Benefits

• Wide setting range for different applications: 5-25 kPa, 20-40 kPa, 20-65 kPa, 35-75 kPa, 60-100 kPa• Ensures correct balance regardless of pressure fluctuations in the system• Eliminates noise problems• Shut-off and draining functions (DN 15-50 valves)• Can be installed directly onto bends and reducers• Compact design ensures flexible installation• Robust construction, pressure class PN25 (PN16)• Accurate and easy setting of designed flow in combination with Nexus Valve Fluctus or Nexus Valve Vertex• Possible to do project handovers in stages due to zone balancing• Partial close-downs can be done easily without influencing other parts of the system• Easy commissioning saves time and money• No overflows, no unnecessary energy consumption, better thermal comfort• Spring housing dismounted making installation in restricted spaces or onto compact units easier (DN 65-80 valves)

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2. Introduction

2.3 Design

DN 15-50The Nexus Valve Passim is installed in the return line. The supply line pressure is channeled above the diaphragm of the Nexus Valve Passim valve through a capillary tube, connected to a partner valve like the Nexus Valve Fluctus, Nexus Valve Vertex or in some instances just to a T-piece in the system. When system pressure increases, it also increases above the internal diaphragm of the Nexus Valve Passim, forcing the spindle downwards and thereby closing the valve gradually. As a result a constant pressure drop is obtained across the circuit controlled by the Nexus Valve Passim.

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1 - Spindle for setting (Allen key)2 - Connection of capillary tube3 - Variable ΔP spring4 - Pressure relieved valve cone5 - Valve seat6 - Drain valve and pressure measuring7 - Rolling diaphragm8 - Handle for system isolation

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DN 65-80The Nexus Valve Passim is installed either in the supply or the return line. The supply line pressure is channeled above the diaphragm and the return line pressure under the diaphragm, through capillary tubes. One capillary tube can be connected to a partner valve like the Nexus Valve Fluctus or to a T-piece in the system, and the other capillary tube to the flange of the Nexus Valve Passim valve. When system pressure increases, it also increases above the internal diaphragm of the Nexus Valve Passim, forcing the cone downwards and thereby closing the valve gradually. The result is a constant pressure drop obtained across the circuit controlled by the Nexus Valve Passim. Without the actuator the valve is held in an open position by means of a spring. With force applied on the spindle, the valve will close.

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1 - Union nut for valve 2 - Venting 3 - Nipple for capillary tube 4 - Diaphragm housing 5 - Diaphragm 6 - Regulating knob 7 - Capillary tube 8 - Valve housing 9 - Valve cone10 - Locking ring11 - Nut12 - Stud bolt13 - Gasket14 - Gasket for actuator15 - Disc16 - Spring17 - Valve seat

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2. Introduction

2.4 Pressure balancing

DN 15-50The Nexus Valve Passim is provided with a selection of actuators for different pressure ranges. Depending on the actuator type the Nexus Valve Passim is factory pre-set at:

• 10 kPa - actuator 5-25 kPa for Nexus Valve Passim DN 15 - 50• 30 kPa - actuator 20-40 kPa for Nexus Valve Passim DN 15 - 50• 40 kPa - actuator 20-65 kPa for Nexus Valve Passim DN 15 - 32• 60 kPa - actuator 35-75 kPa for Nexus Valve Passim DN 40 - 50• 80 kPa - actuator 60-100 kPa for Nexus Valve Passim DN 50

An Allen key is used for differential pressure setting of the Nexus Valve Passim. The black handle enables flow isolation.

By using an Allen key any setting within the differential pressure range can be provided. The flow is isolated by rotating the black handle.

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DN 65-80The Nexus Valve Passim is provided with a selection of actuators for different pressure ranges. Depending on the actuatortype the Nexus Valve Passim is factory pre-set at:

• 50 kPa - actuator 20-80 kPa for Nexus Valve Passim DN 65 - 80• 100 kPa - actuator 70-130 kPa for Nexus Valve Passim DN 65 - 80

The Nexus Valve Passim with an integrated regulating knob for differential pressure setting.

By rotating the regulating knob any setting within the differential pressure range can be provided.

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2. Introduction

2.5 With partner valve

DN 15-50The Nexus Valve Passim can be used in combination with the Nexus Valve Vertex with drain, as a partner valve. In this case the capillary tube is connected to the Nexus Valve Vertex valve installed in the supply line. The pre-setting of the differential pressure is set by use of an Allen key in the Nexus Valve Passim valve and the design flow is then set on the Nexus Valve Vertex valve. When the capillary tube is connected to the drain valve on the P/T pont with the greater measured pressure, the Nexus Valve Vertex valve is inside the circuit controlled by the Nexus Valve Passim valve. In this case the pressure loss across the Nexus Valve Vertex valve must be added to the pressure loss in the controlled circuit and needs to be taken into account when setting the Nexus Valve Passim. When the capillary tube is connected to the drain valve on the P/T port with the lower measured pressure, the Nexus Valve Vertex valve is outside the circuit controlled by the Nexus Valve Passim valve.

The Nexus Valve Passim combined with the Nexus Valve Vertex as a partner valve.

The Nexus Valve Passim valve can also be used in combination with the Nexus Valve Fluctus with drain, as a partner valve. In this case the capillary tube is connected to the Nexus Valve Fluctus installed in the supply line. The pre-setting of the differential pressure is made as mentioned above, while the design flow can be easily and precisely set when measuring the direct flow – utilising the unique measuring feature of the Nexus Valve Fluctus. When the Nexus Valve Fluctus is used as a partner valve it is always in the circuit controlled by the Nexus Valve Passim valve. The pressure loss across the Nexus Valve Fluctus must therefore be added to the pressure loss in the controlled circuit and needs to be taken into account when setting the Nexus Valve Passim valve. The Nexus Valve Passim can also be installed in combination with the Nexus Valve Relax with drain to maintain constant differential pressure, service the controlled part of the system and measure the flow.

The Nexus Valve Passim combined with the Nexus Valve Fluctus as a partner valve.

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DN 65-80Nexus Valve Passim can be used in combination with a Nexus Valve Fluctus with drain, as a partner valve. In this case one capillary tube is connected to the Nexus Valve Fluctus and the other capillary tube to the flange of the Nexus Valve Passim. The pre-setting of the differential pressure is set by use of the regulating knob on the Nexus Valve Passim valve and the design flow is then set on the Nexus Valve Fluctus valve.

The Nexus Valve Passim combined with a Nexus Valve Fluctus as a partner valve.

When the Nexus Valve Fluctus is used as a partner valve and installed in the supply line, it is within the circuit controlled by the Nexus Valve Passim. In this case the pressure loss across the Nexus Valve Fluctus valve adds to the pressure loss in the controlled circuit and needs to be taken into account when setting the Nexus Valve Passim valve.

The Nexus Valve Passim DN 65 - 80 can be installed in the return line. Pressure loss across the Nexus Valve Fluctus (partner valve) is added to the pressure loss in the controlled circuit.

When the Nexus Valve Fluctus is used as a partner valve and installed in the return line, it is outside the circuit controlled by the Nexus Valve Passim. Consequently its pressure loss is not taken into account when setting the Nexus Valve Passim.

The Nexus Valve Passim DN 65 - 80 can be installed in the supply line. Pressure loss across the Nexus Valve Fluctus (partner valve) is not added to the pressure loss in the controlled circuit.

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2. Introduction

2.6 Mounting

Nexus Valve Passim DN15-50

The Nexus Valve Passim valve must always be installed in the return line. No straight piping is required before and after the Nexus Valve Passim. It can be installed directly on bends and flexible hoses, etc.

System flushing is to be done before the capillary tube is mounted. The capillary tube is connected onto the Nexus Valve partner valve (or a T-piece) on the supply side. It has to be flushed to ensure that there is no air left. The capillary tube is then mounted onto the Nexus Valve Passim and thus the differential pressure controller is active.

The setting of the differential pressure is done by using an Allen key and counting the number of complete turns. The turns are to be performed clockwise, from the first (pre-set) position of:5.0 kPa for Nexus Valve Passim 5-25 kPa,20 kPa for Nexus Valve Passim 20-40 kPa14 kPa for Nexus Valve Passim 20-65 kPa35 kPa for Nexus Valve Passim 35-75 kPa60 kPa for Nexus Valve Passim 60-100 kPa

The setting tables indicate how many turns of the (4 mm) Allen key are required to achieve the desired Nexus Valve Passim setting. No more turns than stated in the tables must be performed counting from the first position.

When using a flowmeter the differential pressure across the riser or zone can be determined. After connecting the flowmeter to the high pressure port on the Nexus Valve Fluctus (or the Nexus Valve Vertex) and to the drain valve of the Nexus Valve Passim, the manometer will display the pressure drop across the riser and the partner valve. When a Nexus Valve Fluctus is used as a partner valve, its pressure drop is always included in the circuit controlled by the Nexus Valve Passim valve. When using a Nexus Valve Vertex as a partner valve, it is important to check if the pressure drop across the valve is included in the circuit controlled by the Nexus Valve Passim valve or not (this depends into which of the two Nexus Valve Vertex measuring points the flowmeter needle is inserted).

When the system is pressure tested, the capillary tube must be connected and all valves in the circuit after the Nexus Valve Passim valve opened. This is required to secure the same static pressure on both sides of the diaphragm in order to avoid damaging the differential pressure controller.

Maximum test pressure is 25 bar.

Isolation of the system flow by means of the Nexus Valve Passim is done by turning the black handle clockwise until the valve is fully closed. To avoid damaging the differential pressure controller during isolation the pressure drop across the valve should never exceed 250 kPa. An alternative is to dismount the capillary tube on one side before isolating the valve to protect the differential pressure controller. When valves are shut off, the secondary side of the system can be drained through the 3/4” externally threaded drain valve on the Nexus Valve Passim. The end cap needs to be removed, hose attached and the ball valve opened to enable draining.

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Nexus Valve Passim DN65-80

An arrow on the Nexus Valve valve housing indicates the flow direction to be respected.The Nexus Valve Passim can be installed in any position in the return or in the supply line.

No straight piping is required before and after the Nexus Valve Passim. It can be installed directly on bends and flexible hoses, etc.

System flushing and pressure testing is to be done before the actuator and the capillary tubes are mounted. The Nexus Valve Passim is normally open when the actuator is not mounted.Maximum system pressure is 16 bar.

After the installation of the actuator and the capillary tubes, the diaphragm chamber has to be vented by bleeding through the vent plugs.

The setting of the differential pressure is done by turning the regulating knob. The edge of the knob indicates the required differential pressure on the actuator scale.

When using a flowmeter the differential pressure across the riser or zone can be determined. After connecting the flowmeter to the high pressure port on the partner valve (Nexus Valve Fluctus) and to the, provided as an accessory, drain valve installed in a T-piece, the flowmeter will display the pressure drop in the controlled circuit.

The Nexus Valve Passim valve does not incorporate a shut off function. It is recommended to install isolation valves to be able to service the controlled circuit.

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2. Introduction

2.7 Operation

Depending on the application, the Nexus Valve Passim can either be used as a zone valve placed in risers or branches controlling a constant pressure difference across multiple terminal units, or as a terminal unit valve ensuring the required pressure drop across each terminal unit at all loads.

Radiator heating system with presettable thermostatic radiator valves.

The Nexus Valve Passim provides constant differential pressure across a motorized valve on a terminal unit.

When the Nexus Valve Passim valve is installed in combination with Nexus Valve Fluctus or Nexus Valve Vertex, the valves can be used as both a constant pressure regulator and as a maximum flow limiter. This ensures each zone or terminal unit the required pressure drop and that the designed flow will never be exceeded.

Radiator heating system with non-presettable thermostatic radiator valves.

Such a solution is widely used in radiator heating systems with non-presettable thermostatic radiator valves.

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Nexus Valve Passim along with Nexus Valve Fluctus can be used to limit maximum flow in long branches with several terminal units. The flow distribution among the terminal units is ensured by the proper commissioning of static balancing valves and the operation of motorized valves.

System with terminal units controlled by a Nexus Valve Passim and balanced by a Nexus Valve Fluctus.

As Nexus Valve Passim ensures the required differential pressure for a circuit under all loads, it is possible to do project handovers in stages due to zone balancing – saving both time and money spent on re-commissioning. In practice parts of a building can be taken into use gradually as it is completed ensuring a cost effective handover of the entire project. Partial close-downs can also be done easily without influencing other parts of the system.

The Nexus Valve Passim will ensure no overflows and thereby no unnecessary energy consumption, and it will eliminate noise problems, providing a perfectly controlled system.

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3. Applications

DN 15-50

Application 1 - Heating system with pre-settable thermostatic radiator valves

Differential pressure across the circuits is stabilised by using Nexus Valve Passim valves.

In systems with pre-settable thermostatic radiator valves (TRV), the stabilised differential pressure allows optimum conditions to control the room temperature. By pre-setting the TRV valves, flow is limited and overflow situations are avoided. Noise problems are at the same time also eliminated when using Nexus Valve Passim valves.

Application 2 - Heating system with non-presettable thermostatic radiator valves

Differential pressure across the circuits is stabilised using Nexus Valve Passim valves. Some systems are equipped with non-presettable thermostatic radiator valves (TRV). Such installations are hard to regulate properly, and significant overflow situations can occur. The Nexus Valve Passim will stabilise the differential pressure across a circuit and provide proper conditions to control the room temperature. When installed with a Nexus Valve Fluctus or a Nexus Valve Vertex as partner valve, the maximum flow can be limited to design flow rate. Overflow situations in the circuit are thereby avoided. This will not provide the correct distribution of flow among the radiators, but it will improve the system performance substantially. Noise nuisances are at the same time also eliminated when using Nexus Valve Passim valves.

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Application 3A - Central heating system with Nexus Valve Passim and Nexus Valve Vertex

The Nexus Valve Vertex valve and the Nexus Valve Passim differential pressure control valve can be connected in a way so that the Nexus Valve Vertex valve is inside the circuit controlled by the Nexus Valve Passim valve. This is done when the capillary tube from the Nexus Valve Passim valve is connected to the drain valve at the P/T port of the Nexus Valve Vertex valve with the higher measured pressure. This application is common for heating systems with non-presettable thermostatic radiator valves. In this case the pressure loss across the Nexus Valve Vertex valve needs to be taken into account when setting the Nexus Valve Passim differential pressure control valve. The flow obtained across the Nexus Valve Vertex valve is kept constant due to the constant differential pressure obtained (as long as there is no load change required from the terminal units).

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3. Applications

Application 3B - Central heating system with Nexus Valve Passim and Nexus Valve Vertex

The Nexus Valve Vertex valve and the Nexus Valve Passim differential pressure control valve can be connected in a way so that the Nexus Valve Vertex valve is outside the circuit controlled by the Nexus Valve Passim valve. This is done when the capillary tube from the Nexus Valve Passim valve is connected to the drain valve at the P/T plug of the Nexus Valve Vertex valve with the lower measured pressure. This application is common for heating systems with pre-settable thermostatic radiator valves. The Nexus Valve Vertex valve can in this application be used as a measuring valve to check if the pre-setting made on the thermostatic radiator valves is correct and if the designed flow is achieved. The Nexus Valve Vertex valve is in this application typically fully open or in a position providing just enough pressure loss required for flow measurement. In this way the pressure loss in the system is kept low.

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Application 4 - Central heating system with the Nexus Valve Passim and the Nexus Valve Relax

The Nexus Valve Relax “shut-off valve”can be used as a partner valve to the Nexus Valve Passim. This combination is suitable for systems with presettable thermostatic radiator valves. The individual flow is set on the thermostatic radiator valve, whereas the flow for the riser can be verified on the Nexus Valve Relax provided that the pressure loss across its measuring points is at least 3.0 kPa. The Nexus Valve Relax can be inside or outside the controlled by the Nexus Valve Passim part of the system.

Application 5 - Heating system with differential pressure control valves on risers and manual balancing valves on sub-circuits

A Nexus Valve Passim on each riser provides a stable differential pressure from the main pipe to the risers and to the sub-circuits. A Nexus Valve Fluctus or a Nexus Valve Vertex on each sub-circuit prevents overflow situations.

The differential pressure limitation function of the Nexus Valve Passim valve will furthermore prevent noise problems in the system.

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3. Applications

Application 6 - Cooling system with differential pressure control valves on branches and manual balancing valves on terminal units

In a system with a high concentration of small terminal units, the differential pressure can be stabilised across a group of terminal units using the Nexus Valve Passim. Nexus Valve Fluctus or Nexus Valve Vertex on each terminal unit limit at the same time the flow according to design conditions. The differential pressure control of the Nexus Valve Passim valve will furthermore prevent noise problems in the system.

Application 7 - Underfloor heating system

In a system with several underfloor heating manifolds the differential pressure is stabilized by use of Nexus Valve Passim on each branch. The flow adjustment in one manifold will not affect the flow in the remaining manifolds.

Nexus Valve Fluctus or Nexus Valve Vertex will ensure the designed flow in every manifold. As a result of this, system commissioning is easy, allowing time and cost savings, and the design flow is never exceeded.

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Application 8 - Flat station and district heating system

Nexus Valve Passim can be installed in systems with flat stations. In this type of application flow fluctuations, due to a significant difference between heat consumption for domestic hot water production and for heating purpose, is a typical problem. By installing Nexus Valve Passim the differential pressure is stabilized in every section of the system. The Nexus Valve Passim ensures that a changed flow in one section of the system does not affect the flow and operation of the remaining part of the system.

The same function as above applies to district heating systems. Nexus Valve Passim installed in district heating substations will provide stable working conditions for motorized valves on heat exchangers. As a result motorized valves operate only in reference to the changing heat load and not to compensate for fluctuating pressure in the district heating system.

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3. Applications

DN 65-80The Nexus Valve Passim DN 65 and DN 80 can be used in applications 1-8 as well as in the following ones:

Application 9 - Precise temperature control in air handling units

When temperatures have to be kept within close limits like in ventilating plants, control may be difficult if the differential pressure in the system is not constant. This may be overcome by installing a Nexus Valve Passim which stabilizes the differential pressure across the motorized valve. As a result the motorized valve reacts only on temperature signals and not on pressure fluctuations.

Application 10 - Precise temperature control in domestic water and central heating systems

The Nexus Valve Passim valve will in a hot water tank circuit (heat exchanger) or in a central heating system maintain a constant differential pressure across the motorized valve. By providing a stable working condition the motorized valve reacts only on the temperature signal and does not have to compensate for pressure fluctuations.

Application 11 - Pressure relief by pump or supply and return line by-pass

The Nexus Valve Passim can be used in by-pass around pumps or across the supply and return lines of a circuit. This prevents the pump from working against a dead head when all the subcircuits are closed down.

Note: For this application the Nexus Valve Passim with reverse acting valve needs to be ordered. The valve is provided on request only!

The Nexus Valve Passim can be installed in the return or the supply line. Installation in the return line is preferable where there is a risk of air in the system, and in high buildings where the pressure in the return pipe does not considerably exceed the static pressure. For low buildings (and high pressures) it is preferable to install the Nexus Valve Passim in the supply line to reduce the pressure in terminal units.

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4. Product data sheet

4.1 Product finder

Nexus Valve Passim DN 15-50

Nexus Valve Passim

72.0 108.0 216 288 360144

l/s

l/h

Flow rate

0.02 0.030.010.005 0.007 0.04 0.06 0.08 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0

36.0

4.0 3.0 2.0

720 1080 1440 1800 2160 2880 3600 7200 10800 1440018.0 25.2

5.0

18000

6.0

21600

DN 32

DN 40

DN 25

DN 50

DN 20

DN 15

Nexus Valve Vertex – partner valve to Nexus Valve Passim

72.0 108.0 216 288 360144

l/s

l/h

Flow rate

0.02 0.030.010.005 0.007 0.04 0.06 0.08 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0

36.0

4.0 3.0 2.0

720 1080 1440 1800 2160 2880 3600 7200 10800 1440018.0 25.2

DN 32

DN 40

DN 25

DN 50

DN 20

DN 15

Nexus Valve Fluctus – partner valve to Nexus Valve Passim

72.0 108.0 216.0 288.0 360.0144.0

l/s

l/h

Flow rate0.02 0.030.010.005 0.007 0.04 0.06 0.08 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0

36.0

4.0 3.0 2.0

720.0 1080.0 1440.0 1800.0 2160.0 2880.0 3600.0 7200.0 10800.0 14400.018.0 25.2

DN 15 H DN 20 S

DN 20 H & DN 25 S

DN 40 H

DN 50 H

DN 15 S & DN 20 L

DN 25 H & DN 32 H

DN 15 L

DN 15 UL

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Nexus Valve Passim DN 65-80

Nexus Valve Passim

720 1080 2160 2880 36001440l/sl/h

Flow rate0.2 0.30.1 0.4 0.6 0.8 1 2 3 4 6 8 10

360403020

7200 10800 14400 21600 28800 36000 72000 108000 14400060

216000

DN 80

DN 65

Nexus Valve Fluctus – partner valve to Nexus Valve Passim

l/sl/h

Flow rate0.2 0.30.1 0.4 0.6 0.8 1 2 3 4 6 8 10 403020 607720 1080 2160 2880 36001440360 7200 10800 14400 21600 28800 36000 72000 108000 144000 216000

DN 80

DN 65

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Flow range Dimension Differential pres-sure setting range kPa

Factory setting [kPa]

l/s l/h

0.005-0.222 18-800 DN 15 5-25 10

0.010-0.281 36-1010 20-40

0.010-0,360 36-1290 20-65

0.007-0.347 28-1250 DN 20 5-25

0.016-0.439 56-1580 20-40 30

0.016-0560 56-2020 20-65 ...

0.013-0.556 45-2000 DN 25 5-25

0.025-0.703 89-2530 20-40

0.025-0896 89-3230 20-65

0.019-0.875 70-3150 DN 32 5-25

0.039-1.11 141-3980 20-40

0.039-1.41 141-5080 20-65

0.031-1.39 112-5000 DN 40 5-25

0.062-1.76 224-6330 20-40

0.082-2.41 296-8660 35-75 60

0.062-2.78 224-10000 DN 50 5-25

0.124-3.51 447-12650 20-40

0.164-4.81 592-17320 35-75

0.215-5.56 775-20000 60-100 80

0.289-14.4 1040-51880 DN 65 20-80 50

0.539-18.4 1940-66130 70-130

0.397-19.9 1430-71550 DN 80 20-80

0.689-25.3 2480-87640 70-130 100

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4.2 Nexus Valve Passim DN 15-50, DN 65-80

4.2.1 Passim DN 15-32 female/female with drain

Dimensions Specifications

Max. temperature 120°C (135°C temporarily)Min. temperature -20°CMax. differential pressure 250 kPaMax. pressure 25 barDifferential pressuresetting range 5-25 kPa, 20-40 kPaAccuracy +/-25%Marking on valve DN, PN, flow arrow, DR, Kvs Differential pressure setting rangeConnection Female thread ISO 7/1 parallelValve housing, seat,cone and internalmechanical parts DR Brass CW602NSpring Stainless steelSealings and diaphragm EPDMIsolation knob PPS

DN A (mm) B (mm) C (mm) (diameter) D (mm)

DN 15 61 101 62 60,5

DN 15 61 101 62 60,5

DN 20 71 122 62 62

DN 20 71 122 62 62

DN 25 84 146 96 65

DN 25 84 146 96 65

DN 32 96 148 96 69

DN 32 96 148 96 69

Note! Information on press adaptors and other is provided in the chapter Accessories.

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Valve Article Dimension Nom. Inch

Kvsm3/h

ΔP Setting Range [kPa]

DN 15

N80597.521 DN 15 ½“ 1.6 5-25

N80597.522 DN 15 ½“ 1.6 20-40

N80597.5222 DN 15 ½“ 1.6 20-65

DN 20

N80597.523 DN 20 ¾” 2.5 5-25

N80597.524 DN 20 ¾” 2.5 20-40

N80597.5242 DN 20 ¾” 2.5 20-65

DN 25

N80597.525 DN 25 1” 4.0 5-25

N80597.526 DN 25 1” 4.0 20-40

N80597.5262 DN 25 1” 4.0 20-65

DN 32

N80597.527 DN 32 1¼” 6.3 5-25

N80597.528 DN 32 1¼” 6.3 20-40

N80597.5282 DN 32 1¼” 6.3 20-65

30


4.2.2 Passim DN 40 female/female with drain Passim


Max. temperature 120°C (135°C temporarily)Min. temperature -20°CMax. differential pressure 250 kPaMax. pressure 25 barDifferential pressuresetting range 5-25 kPa, 20-40 kPa, 35-75 kPaAccuracy +/-25%Marking on valve DN, PN, flow arrow, DR, Kvs Differential pressure setting rangeConnection Female thread ISO 7/1 parallelValve housing, seat,cone and internalmechanical parts DR Brass CW602NSpring Stainless steelSealings and diaphragm EPDMIsolation knob PPSTop and bottom plates EN-GJL-250 (GG25)


DN 40 99,5 194 138 73

DN 40 99,5 220 138 73

DN 40 99,5 235 138 73


31


Kvsm3/h


DN 40

N80597.570 DN 40 1½“ 10 5-25

DN 40

N80597.571 DN 40 1½“ 10 20-40

DN 40

N80597.572 DN 40 1½“ 10 35-75

32


4.2.3 Passim DN 50 female/female with drain


Max. temperature 120°C (135°C temporarily)Min. temperature -20°CMax. differential pressure 250 kPaMax. pressure 25 barDifferential pressuresetting range 5-25 kPa, 20-40 kPa, 35-75 kPa, 60-100kPaAccuracy +/-25%Marking on valve DN, PN, flow arrow, DR, Kvs Differential pressure setting rangeConnection Female thread ISO 7/1 parallelValve housing EN-GJL-250 (GG25) Seat, cone and internalmechanical parts DR Brass CW602NSpring Stainless steelSealings and diaphragm EPDMIsolation knob PPSTop and bottom plates EN-GJL-250 (GG25)


DN 50 135 206,5 138 76,5

DN 50 135 232 138 76,5

DN 50 135 247,5 138 76,5

DN 50 135 286 138 76,5


33


Kvsm3/h


DN 50

N80597.580 DN 50 2“ 20 5-25

DN 50

N80597.511 DN 50 2“ 20 20-40

DN 50

N80597.582 DN 50 2“ 20 35-75

DN 50

N80597.583 DN 50 2“ 20 60-100

34


4.2.4 Passim DN 15-32 female/female without drain


Max. temperature 120°C (135°C temporarily)Min. temperature -20°CMax. differential pressure 250 kPaMax. pressure 25 barDifferential pressuresetting range 5-25 kPa, 20-40 kPaAccuracy +/-25%Marking on valve DN, PN, flow arrow, DR, Kvs Differential pressure setting rangeConnection Female thread ISO 7/1 parallelValve housing, seat,cone and internalmechanical parts DR Brass CW602NSpring Stainless steelSealings and diaphragm EPDMIsolation knob PPS

DN A (mm) B (mm) C (mm) (diameter)

DN 15 61 101 62

DN 15 61 101 62

DN 20 71 122 62

DN 20 71 122 62

DN 25 84 146 96

DN 25 84 146 96

DN 32 96 148 96

DN 32 96 148 96


35


Kvsm3/h


DN 15

N80597.560 DN 15 ½“ 1.6 5-25

N80597.561 DN 15 ½“ 1.6 20-40

DN 20

N80597.562 DN 20 ¾” 2.5 5-25

N80597.563 DN 20 ¾” 2.5 20-40

DN 25

N80597.564 DN 25 1” 4.0 5-25

N80597.565 DN 25 1” 4.0 20-40

DN 32

N80597.566 DN 32 1¼” 6.3 5-25

N80597.567 DN 32 1¼” 6.3 20-40

36


4.2.5 Passim DN 15 male/male without drain


Max. temperature 120°C (135°C temporarily)Min. temperature -20°CMax. differential pressure 450 kPaMax. pressure 16 barDifferential pressuresetting range 5-25 kPa, 20-40 kPaAccuracy +/-25%Marking on valve DN, PN, flow arrow, DR, Kvs Differential pressure setting rangeConnection Male thread G 3/4” ISO228Valve housing, seat,cone and internalmechanical parts DR Brass CW602NSpring Stainless steelSealings and diaphragm EPDMIsolation knob PPS

DN A (mm) B (mm) C (mm) (diameter)

DN 15 65 101,9 62

DN 15 65 101,9 62



Kvsm3/h


DN 15

N80597.550 DN 15 ¾“ 1.6 5-25

N80597.551 DN 15 ¾“ 1.6 20-40

37

4.2.6 Passim DN 65-80 flange/flange


Max. temperature 120°C 120°C (150°C only if the actuator is installed below the valve)Min. temperature -20°CMax. differential pressure 1600 kPaMax. pressure 16 barDifferential pressuresetting range 20-80 kPa, 70-130 kPaLeakage range Less than 0.05% of the full flow (according to VDI/VDE 2174)Marking on valve DN, PN, flow arrow, Kvs, differential pressure setting range, materialConnection Flange EN 1092-2 PN16Valve housing Cast iron EN-GJS-400-15Seat, cone and spindle Stainless steelSpring Stainless steelNuts and bolts 24 CrMo 5/A4Sealing and membrane EPDM

DN A (mm) B (mm) C (mm) D (mm) E (mm) (diameter)

DN 65 290 264 508 400 240

DN 80 310 279 508 400 240



Kvsm3/h


DN 65

N80597.602 DN 65 2½“ 58 20-80

N80597.604 DN 65 2½“ 58 70-130

DN 80

N80597.605 DN 80 3“ 80 20-80

N80597.603 DN 80 3“ 80 70-130

38


4.3 Flow diagrams

The graphs are used to determine the total pressure loss across the Nexus Valve Passim at the required flow.

DN 15 - female/female and male/male

Pressure drop across valve - ΔPpassim kPa40

35

30

25

20

15

10

5

0

0.00

0.0

bar0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.0 Flowl/sl/h

0.05

180

0.10

360

0.15

540

0.20

720

0.25

900

0.30

1080

39

DN 20 - female/female


35

30

25

20

15

10

5

0

0.00

0.0

bar0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.0 Flowl/sl/h

0.05

180

0.10

360

0.15

540

0.20

720

0.25

900

0.30

1080

0.35

1260

0.40

1440

0.45

1620

40




35

30

25

20

15

10

5

0

0.00

0.0

bar0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.0 Flowl/sl/h

0.05

180

0.10

360

0.15

540

0.20

720

0.25

900

0.30

1080

0.35

1260

0.40

1440

0.45

1620

0.50

1800

0.55

1980

0.60

2160

0.65

2340

0.70

2520

0.75

2700

41



35

30

25

20

15

10

5

0

0.00

0.0

bar0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.0 Flowl/sl/h

0.05

180

0.10

360

0.15

540

0.20

720

0.25

900

0.30

1080

0.35

1260

0.40

1440

0.45

1620

0.50

1800

0.55

1980

0.60

2160

0.65

2340

0.70

2520

0.75

2700

0.80

2880

0.85

3060

0.90

3240

0.95

3420

1.00

3600

1.05

3780

1.10

3960

1.15

4140

42




70

65

60

55

50

45

40

35

30

25

20

15

10

5

0

0.00

0.0

bar0.75

0.70

0.65

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.0 Flowl/sl/h

0.25

900

0.50

1800

0.75

2400

1.00

3600

1.25

4500

1.50

5400

1.75

6300

2.00

7200

2.25

8100

2.50

9000

43



95

90

85

80

75

70

65

60

55

50

45

40

35

30

25

20

15

10

5

0

0.00

0.0

bar1.00

0.95

0.90

0.85

0.80

0.75

0.70

0.65

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.0 Flowl/sl/h

0.50

1800

1.00

3600

1.50

5400

2.00

7200

2.50

9000

3.00

10800

3.50

12600

4.00

14400

4.50

16200

5.00

18000

5.50

19800

44


DN 65 - flange/flange


120

110

100

90

80

70

60

50

40

30

20

10

0

0

0.0

bar1.30

1.20

1.10

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

0.10

0.0 Flowl/sl/h

1

3600

2

7200

3

10800

4

14400

5

18000

6

21600

7

25200

8

28800

9

32400

10

36000

11

39600

12

43200

13

46800

14

50400

15

54000

16

57600

17

61200

18

64800

19

68400

45



120

110

100

90

80

70

60

50

40

30

20

10

0

bar1.30

1.20

1.10

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

0.10

0.0 Flowl/sl/h

0

0.0

1

3600

2

7200

3

10800

4

14400

5

18000

6

21600

7

25200

8

28800

9

32400

10

36000

11

39600

12

43200

13

46800

14

50400

15

54000

16

57600

17

61200

18

64800

19

68400

20

72000

21

75600

22

79200

23

82800

24

86400

25

90000

26

93600

46


4.4 Valve sizing

The available flow ranges in reference to the required differential pressure settings on the Nexus Valve Passim are specified in the tables.


SettingkPa

Min. flow l/h

Max. flow l/h

5 18 3586 20 3927 21 4238 23 4539 24 48010 25 50611 27 53112 28 55413 29 57714 30 59915 31 62016 32 64017 33 66018 34 67919 35 69720 36 71621 37 73322 38 75023 38 76724 39 78425 40 800

SettingkPa

Min. flow l/h

Max.flow l/h

20 36 71621 37 73322 38 75024 39 78425 40 80026 41 81627 42 83129 43 86230 44 87631 45 89133 46 91934 47 93335 47 94737 49 97338 49 98639 50 99940 51 1010

SettingkPa

Min. flow l/h

Max.flow l/h

20 36 71623 38 76726 41 81629 43 86232 45 90535 47 94738 49 98641 51 102444 53 106147 55 109750 57 113153 58 116556 60 119759 61 122962 63 126065 64 1290

The Nexus Valve Passim can be combined with the Nexus Valve Vertex or the Nexus Valve Fluctus to provide cons-tant differential pressure in the controlled part of the system as well as to to ensure the option of limiting the maxi-mum flow. For more details the application examples must be consulted.

Partner valve Flow range Dimension Description

l/s l/h

0.0054-0.14819-530

DN 15 Nexus Valve Vertex with drain. Flow dia-gram can be found in chapter 3.2 - 14

0.0076-0.0350.0172-0.0740.036-0.1480.074-0.325

27-12662-266130-530267-1170

DN 15ULDN 15LDN 15SDN 15H

Nexus Valve Fluctus with drain. Flow diagrams can be found in chapter 3.1 - 22-23

- - DN 15 Nexus Valve Relax with drain– chapter 6.1 - 12

47

DN 15 - male/male

SettingkPa

Min. flowl/h

Max. flowl/h

5 18 3586 20 3927 21 4238 23 4539 24 48010 25 50611 27 53112 28 55413 29 57714 30 59915 31 62016 32 64017 33 66018 34 67919 35 69720 36 71621 37 73322 38 75023 38 76724 39 78425 40 800

SettingkPa

Min. flowl/h

Max. flowl/h

15* 31 62016* 32 64018* 34 67919* 35 69720 36 71621 37 73323 38 76724 39 78425 40 80026 41 81628 42 84729 43 86230 44 87631 45 89133 46 91934 47 93335 47 94736 48 96038 49 98639 50 99940 51 1010

* The nominal differential pressure setting range is 20-40 kPa, however 15 kPa - 19 kPa is also achievable.



l/s l/h

0.0054-0.148 19-530 DN 15 Nexus Valve Vertex with drain. Flow dia-gram can be found in chapter 3.2 - 14

0.0076-0.0350.0172-0.0740.036-0.1480.074-0.325

27-12662-266130-530267-1170

DN 15ULDN 15LDN 15SDN 15H



48



SettingkPa

Min. flow l/h

Max. flow l/h

5 28 5596 31 6127 33 6618 35 7079 38 75010 40 79111 41 82912 43 86613 45 90114 47 93515 48 96816 50 100017 52 103018 53 106019 54 109020 56 112021 57 115022 59 117023 60 120024 61 123025 63 1250

SettingkPa

Min. flow l/h

Max. flow l/h

20 56 112021 57 115022 59 117024 61 123025 63 125026 64 128027 65 130029 67 135030 68 137031 70 139033 72 144034 73 146035 74 148037 76 152038 77 154039 78 156040 79 1580

SettingkPa

Min. flow l/h

Max. flow l/h

20 56 111823 60 119926 64 127529 67 134632 71 141435 74 147938 77 154141 80 160144 83 165847 86 171450 88 176853 91 182056 94 187159 96 192062 98 196965 101 2016



l/s l/h


0.036-0.148 0.074-0.325 0.142-0.603

130-530 267-1170 511-2170

DN 20LDN 20SDN 20H



49


SettingkPa

Min. flow l/h

Max. flow l/h

5 45 894 6 49 980 7 53 1060 8 57 1130 9 60 120010 63 127011 66 133012 69 139013 72 144014 75 150015 77 155016 80 160017 82 165018 85 170019 87 174020 89 179021 92 183022 94 188023 96 192024 98 196025 100 2000

SettingkPa

Min. flow l/h

Max. flow l/h

20 89 179022 94 188024 98 196026 102 204028 106 212030 110 219032 113 226034 117 233036 120 240038 123 247040 126 2530

SettingkPa

Min. flow l/h

Max. flow l/h

20 89 178923 96 191826 102 204029 108 215432 113 226335 118 236638 123 246641 128 256144 133 265347 137 274250 141 282853 146 291256 150 299359 154 307262 157 315065 161 3225



l/s l/h


0.142-0.603 0.29-1.25

511-21701044-4500

DN 25SDN 25H

Nexus Valve Fluctus with drain.Flow diagrams can be found in chapter 3.1 - 38

- - DN 20 Nexus Valve Relax with drain – chapter 6.1 - 12

50



SettingkPa

Min. flow l/h

Max. flow l/h

5 70 1410 6 77 1540 7 83 1670 8 89 1780 9 95 189010 100 199011 104 209012 109 218013 114 227014 118 236015 122 244016 126 252017 130 260018 134 267019 137 275020 141 282021 144 289022 148 296023 151 302024 154 309025 158 3150

SettingkPa

Min. flow l/h

Max. flow l/h

20 141 282022 148 296024 154 309026 161 321028 167 333030 173 345032 178 356034 184 367036 189 378038 194 388040 199 3980

SettingkPa

Min. flow l/h

Max. flow l/h

20 141 281723 151 302126 161 321229 170 339332 178 356435 186 372738 194 388441 202 403444 209 417947 216 431950 223 445553 229 458656 236 471459 242 483962 248 496165 254 5079



l/s l/h


0.29-125 1044-4500 DN 32H Nexus Valve Fluctus with drain.Flow diagrams can be found in chapter 3.1 - 44


51


SettingkPa

Min. flowl/h

Max. flowl/h

5 112 2240 6 122 2450 7 132 2650 8 141 2830 9 150 300010 158 316011 166 332012 173 346013 180 361014 187 374015 194 387016 200 400017 206 412018 212 424019 218 436020 224 447021 229 458022 235 469023 240 480024 245 490025 250 5000

SettingkPa

Min. flowl/h

Max. flowl/h

20 224 447021 229 458022 235 469023 240 480024 245 490025 250 500026 255 510027 260 520028 265 529029 269 539030 274 548031 278 557032 283 566033 287 575034 292 583035 296 592036 300 600037 304 608038 308 616039 312 625040 316 6330

SettingkPa

Min. flowl/h

Max. flowl/h

35 296 592037 304 608039 312 625041 320 640043 328 656045 335 671047 343 686049 350 700051 357 714053 364 728055 371 742057 377 755059 384 768061 391 781063 397 794065 403 806067 409 819069 415 831071 421 843073 427 854075 433 8660



l/s l/h


0.44-1.88 1584-6760 DN 40H Nexus Valve Fluctus with drain.Flow diagrams can be found in chapter 3.1 - 50


52



SettingkPa

Min. flowl/h

Max. flowl/h

5 224 4470 6 245 4900 7 265 5290 8 283 5660 9 300 600010 316 633011 332 663012 346 693013 361 721014 374 748015 387 775016 400 800017 412 825018 424 849019 436 872020 447 894021 458 917022 469 938023 480 959024 490 980025 500 10000

SettingkPa

Min. flowl/h

Max. flowl/h

20 447 894021 458 917022 469 938023 480 959024 490 980025 500 1000026 510 1020027 520 1039028 529 1058029 539 1077030 548 1095031 557 1114032 566 1131033 574 1149034 583 1166035 592 1183036 600 1200037 608 1217038 616 1233039 624 1249040 632 12650

SettingkPa

Min. flowl/h

Max. flowl/h

35 592 1183037 608 1217039 624 1249041 640 1281043 656 1312045 671 1342047 686 1371049 700 1400051 714 1428053 728 1456055 742 1483057 755 1510059 768 1536061 781 1562063 794 1588065 806 1613067 819 1637069 831 1661071 843 1685073 854 1709075 866 17320

SettingkPa

Min. flowl/h

Max. flowl/h

60 775 1549062 787 1575064 800 1600066 812 1625068 825 1650070 837 1673072 849 1697074 860 1721076 872 1744078 883 1766080 894 1789082 906 1811084 917 1833086 927 1855088 938 1876090 949 1897092 959 1918094 970 1939096 980 1960098 990 19800100 1000 20000



l/s l/h


0.82-3.51 2952-12630 DN 50H Nexus Valve Fluctus with drain.Flow diagrams can be found in chapter 3.1 - 56


53


20-80 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

20 1040 2594022 1090 2720024 1140 2841026 1180 2957028 1230 3069030 1270 3177032 1310 3281034 1350 3382036 1390 3480038 1430 3575040 1470 3668042 1500 3759044 1540 3847046 1570 3934048 1610 40180

20-80 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

50 1640 4101052 1670 4182054 1710 4262056 1740 4340058 1770 4417060 1800 4493062 1830 4567064 1860 4640066 1890 4712068 1910 4783070 1940 4853072 1970 4922074 2000 4989076 2020 5056078 2050 5122080 2080 51880

70-130 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

70 1940 4853072 1970 4922074 2000 4989076 2020 5056078 2050 5122080 2080 5188082 2100 5252084 2130 5316086 2150 5379088 2180 5441090 2200 5502092 2230 5563094 2250 5623096 2270 5683098 2300 57420

70-130 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

100 2320 58000102 2340 58580104 2370 59150106 2390 59720108 2410 60280110 2430 60830112 2460 61380114 2480 61930116 2500 62470118 2520 63000120 2540 63540122 2560 64060124 2580 64590126 2600 65110128 2630 65620130 2650 66130



l/s l/h

1.8-7.00 650-25200 DN 65 Nexus Valve Fluctus with Combi Drain Maxi for capillary tube connection (Combi Drain Maxi is provided as an accessory). Flow diagram – chapter 3.1 - 59-61-63

3.5-15.0 12600-54000 DN 80

6.2-26.0 22300-93600 DN 100

54



20-80 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

20 1430 3578022 1500 3752024 1570 3919026 1630 4079028 1690 4233030 1750 4382032 1810 4526034 1870 4665036 1920 4800038 1970 4932040 2020 5060042 2070 5185044 2120 5307046 2170 5426048 2220 55430

20-80 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

50 2260 5657052 2310 5769054 2350 5879056 2400 5987058 2440 6093060 2480 6197062 2520 6300064 2560 6400066 2600 6499068 2640 6597070 2680 6693072 2720 6788074 2750 6882076 2790 6974078 2830 7065080 2860 71550

70-130 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

60 2480 6197062 2520 6300064 2560 6400066 2600 6499068 2640 6597070 2680 6693072 2720 6788074 2750 6882076 2790 6974078 2830 7065080 2860 7155082 2900 7244084 2930 7332086 2970 7419088 3000 75050

70-130 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

90 3040 75900 92 3070 76730 94 3100 77560 96 3140 78380 98 3170 79200100 3200 80000102 3230 80800104 3260 81580106 3300 82370108 3330 83140110 3360 83910112 3390 84670114 3420 85420116 3450 86160118 3480 86900120 3510 87640



l/s l/h

1.8-7.00 650-25200 DN 65 Nexus Valve Fluctus with Combi Drain Maxi for capillary tube connection (Combi Drain Maxi is provided as an accessory). Flow diagram – chapter 3.1 - 59-61-63

3.5-15.0 12600-54000 DN 80

55

4.5 Valve setting

The Nexus Valve Passim DN 15 is provided with two pressure setting ranges. The pressure setting is carried out by means of an Allen key. The number of turns needed to obtain the required differential pressure setting is specified in the tables.


Differential pressure setting range 5-25 kPa

Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0 20 1 21 2 22 3 24 4 25 5 26 6 27 7 29 8 30 9 3110 3311 3412 3513 3714 3815 3916 40


Turns kPa

2 20 3 23 4 26 5 29 6 32 7 35 8 38 9 4110 4411 4712 5013 5314 5615 5916 6217 65

Differential pressure setting range Factory setting

5-25 kPa 10 kPa

20-40 kPa 30 kPa

20-65 kPa 40 kPa

Other settingsFactory setting

To set the Nexus Valve Passim to any other setting, turn the Allen key counterclock-wise till the end point is reached and the spring is completely loosened. From this point turn the Allen key clockwise the number of turns that will give the required ΔP-setting according to the tables above. 4 mm Allen key is used for differential pres-sure setting.

56


The Nexus Valve Passim DN 15 is provided with two pressure setting ranges. The pressure setting is carried out by means of an Allen key. The number of turns needed to obtain the required differential pressure setting is specified in the tables.

DN 15 - male/male


Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0* 15 1* 16 2* 18 3* 19 4 20 5 21 6 23 7 24 8 25 9 2610 2811 2912 3013 3114 3315 3416 3517 3618 3819 3920 40

*The nominal differential pressure setting range is 20-40 kPa, however 15 kPa - 19 kPa is also achievable.


5-25 kPa 10 kPa

20-40 kPa 30 kPa



57

Nexus Valve Passim DN 20 is provided with two pressure setting ranges. The pressure setting is carried out by means of an Allen key. The number of turns needed to obtain the required differential pressure setting is specified in the tables.



Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0 20 1 21 2 22 3 24 4 25 5 26 6 27 7 29 8 30 9 3110 3311 3412 3513 3714 3815 3916 40


Turns kPa

2 20 3 23 4 26 5 29 6 32 7 35 8 38 9 4110 4411 4712 5013 5314 5615 5916 6217 65


5-25 kPa 10 kPa

20-40 kPa 30 kPa

20-65 kPa 40 kPa



58





Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0 20 1 22 2 24 3 26 4 28 5 30 6 32 7 34 8 36 9 3810 40


Turns kPa

2 20 3 23 4 26 5 29 6 32 7 35 8 38 9 4110 4411 4712 5013 5314 5615 5916 6217 65


5-25 kPa 10 kPa

20-40 kPa 30 kPa

20-65 kPa 40 kPa



59




Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0 20 1 22 2 24 3 26 4 28 5 30 6 32 7 34 8 36 9 3810 40


Turns kPa

2 20 3 23 4 26 5 29 6 32 7 35 8 38 9 4110 4411 4712 5013 5314 5615 5916 6217 65


5-25 kPa 10 kPa

20-40 kPa 30 kPa

20-65 kPa 40 kPa



60


Nexus Valve Passim DN 40 is provided with three pressure setting ranges. The pressure setting is carried out by means of an Allen key. The number of turns needed to obtain the required differential pressure setting is specified in the tables.



Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0 20 1 21 2 22 3 23 4 24 5 25 6 26 7 27 8 28 9 2910 3011 3112 3213 3314 3415 3516 3617 3718 3819 3920 40


Turns kPa

0 35 1 37 2 39 3 41 4 43 5 45 6 47 7 49 8 51 9 5310 5511 5712 5913 6114 6315 6516 6717 6918 7119 7320 75


5-25 kPa 10 kPa

20-40 kPa 30 kPa

35-75 kPa 60 kPa



61

Nexus Valve Passim DN 50 is provided with four pressure setting ranges. The pressure setting is carried out by means of an Allen key. The number of turns needed to obtain the required differential pressure setting is specified in the tables.



Turns kPa

0 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 1410 1511 1612 1713 1814 1915 2016 2117 2218 2319 2420 25


Turns kPa

0 20 1 21 2 22 3 23 4 24 5 25 6 26 7 27 8 28 9 2910 3011 3112 3213 3314 3415 3516 3617 3718 3819 3920 40


Turns kPa

0 35 1 37 2 39 3 41 4 43 5 45 6 47 7 49 8 51 9 5310 5511 5712 5913 6114 6315 6516 6717 6918 7119 7320 75


Turns kPa

0 60 1 62 2 64 3 66 4 68 5 70 6 72 7 74 8 76 9 7810 8011 8212 8413 8614 8815 9016 9217 9418 9619 9820 100


5-25 kPa 10 kPa

20-40 kPa 30 kPa

35-75 kPa 60 kPa

60-100 kPa 80 kPa



62



The Nexus Valve Passim DN 65 is provided with two differential pressure setting ranges. The differential pressure setting is carried out by means of a regulating knob. The setting scale is clearly marked on the actuator. Any differential pressure setting can be verified by checking the position of the regulating knob edge in reference to the scale.


20-80 kPa 50 kPa

70-130 kPa 100 kPa


Differential pressure setting To set the Nexus Valve Passim to any other setting, turn

the regulating knob so that the edge of the knob points to the required differential pressure on the actuator scale.

The Nexus Valve Passim DN 65 is provided with two capillary tubes so the valve can be installed in the supply or the return line. The valve does not offer the shut off function, thus it is recommended to install isolation valves in the system with Nexus Valve Passim DN 65.

63


The Nexus Valve Passim DN 80 is provided with two differential pressure setting ranges. The differential pressure setting is carried out by means of a regulating knob. The setting scale is clearly marked on the actuator. Any differential pressure setting can be verified by checking the position of the regulating knob edge in reference to the scale.


20-80 kPa 50 kPa

70-130 kPa 100 kPa


Differential pressure setting

To set the Nexus Valve Passim to any other setting, turn the regulating knob so that the edge of the knob points to the required differential pressure on the actuator scale.

The Nexus Valve Passim DN 80 is provided with two capillary tubes so the valve can be installed in the supply or the return line. The valve does not offer the shut off function, thus it is recommended to install service isolation valves in the system with Nexus Valve Passim DN 80.

64

5. Accessoires

There is a wide range of accessories and spare parts available for Nexus Valve Passim valves.These comprise: insulation jackets, press adaptors, high capacity drain valve and other

Accessories Article Dimension Description

N80597.706 DN 15 Nexus Valve Vertex with drain for capillary tube con-nection.

N80597.707 DN 20

N80597.708 DN 25

N80597.709 DN 32

N80597.710 DN 40

N80597.711 DN 50

N80597.530 DN 15U Nexus Valve Fluctus with drain for capillary tube connection.

N80597.531 DN 15L

N80597.532 DN 15S

N80597.533 DN 15H

N80597.534 DN 20L

N80597.535 DN 20S

N80597.536 DN 20H

N80597.537 DN 25S

N80597.538 DN 25H

N80597.539 DN 32H

N80597.540 DN 40H

N80597.541 DN 50H

N80597.726 DN 15

N80597.727 DN 20

N80597.728 DN 25

N80597.729 DN 32

N80597.730 DN 40

N80597.731 DN 50

65

Accessories Article Dimension Description

N80597.0001 15 mm × ½” Pre-sealed press adaptors (2 pcs)for valve DN 15 -50, max. 16 bar

N80597.0002 18 mm × ½”

N80597.0003 15 mm x ¾"

N80597.0004 18 mm x ¾"

N80597.0005 22 mm x ¾”

N80597.0006 28 mm x 1”

N80597.0007 35 mm x 1¼”

N80597.0008 42 mm x 1½”

N80597.0009 54 mm x 2"

N80597.0203 ¾” Cap with test point installed on the drain or T-piece valve of the Nexus Valve Passim for measuring the differential pressure during commissioning

N80597.471 DN 65 Nexus Valve Fluctus, when used as a partner valve, must be provided with Combi Drain Maxi for capillary tube connection. The drain is provided as an accessory and must be ordered separately.

N80597.472 DN 80

N80597.473 DN 100

N80597.0204 R ¼” Combi Drain Maxi – drain with measuring point for Nexus Valve Fluctus DN 65 - 600. The capillary tube from the Nexus Valve® Passim can be connected to the ¼” coupling delivered along with the Combi Drain Maxi and installed on the drain

N80597.0208 1.0 m, Ø 4 mm Capillary tube with ” connector for Nexus Valve Passim DN 15 -50

N80597.0209 2.0 m, Ø 4 mm Capillary tube with ” connector for Nexus Valve Passim DN 15 -50

66

6. Sizing examples

6.1 DN 15-50

6.1.1 System with Nexus Valve Passim and Nexus Valve Fluctus

A Nexus Valve Passim and a Nexus Valve Fluctus partner valve is in this example sized to the following conditions:

The designed branch flow controlled by the Nexus Valve Passim is 0.4 l/s (1440 l/h).The available system differential pressure (ΔPa) is 50 kPa.The required branch differential pressure (ΔPc) is 20 kPa.

ΔP BV

ΔP PASSIM

a

ΔPa = ΔPBV + ΔPc + ΔPPASSIM

ΔPcΔP

Δ Pa - available differential pressure in the systemΔ Pc - differential pressure required for the branchΔ Pbv - pressure loss across Nexus Valve FluctusΔ PPassim - pressure loss across Nexus Valve Passim

The pressure loss across the Nexus Valve Passim valve is found in the product data sheet graphs in chapter 5.1 - 32.

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75

0 180 360 540 720 900 1080 1260 1440 1620 1800 1980 2160 2340 2520 2700


35

30

25

20

1513

10

5

0

bar0.40

0.35

0.30

0.25

0.20

0.150.13

0.10

0.05

0.00 Flowl/sl/h

Graph for Nexus Valve Passim DN 25.

Three valves (in fully open position) can provide the required flow of 0.4 l/s:Nexus Valve Passim DN 20 ΔPpassim = 33 kPaNexus Valve Passim DN 25 ΔPpassim = 13 kPaNexus Valve Passim DN 32 ΔPpassim = 5 kPa

67

The suitable Nexus Valve Fluctus partner valve is selected from the flow diagrams in chapter 3.1. It is recommended to use valves in fully open position at the required flow to reduce the pump head and save energy:

Nexus Valve Fluctus DN 20H ΔPbv = 6.5 kPa (see chapter 3.1 - 30-31)Nexus Valve Fluctus DN 25S ΔPbv = 3.5 kPa (see chapter 3.1 - 38)Nexus Valve Fluctus DN 32H ΔPbv = 1.2 kPa (see chapter 3.1 - 44)

Pressure drop across valve PositionkPa100

504030

20

10

543

bar1.0

0.50.40.3

0.2

0.1

0.050.040.03 Flow

l/sl/h

9.98.07.06.05.0

4.0

3.02.01.00.0

0.14 0.2 0.3 0.4 0.5 0.603

504 720 1080 1440 1800 2170

Graph for Nexus Valve Fluctus DN 25S.

The minimum required ΔPa for each valve set is calculated as follows: ΔPa = ΔPbv + ΔPc + ΔPpassim

DN 20 Min. ΔPa = 6.5 kPa + 20 kPa + 33 kPa = 59.5 kPaDN 25 Min. ΔPa = 3.5 kPa + 20 kPa + 13 kPa = 36.5 kPaDN 32 Min. ΔPa = 1.2 kPa + 20 kPa + 5 kPa = 26.2 kPaTo ensure the best functionality of the Nexus Valve Passim, the smallest possible valve is selected. However, the DN 20solution requires minimum ΔPa of 59.5 kPa to operate properly, and the system provides a ΔPa of only 50 kPa.Therefore the DN 25 valve is selected with an 20-40 kPa actuator. The correct ΔP setting on the Nexus Valve Passim is: ΔPbv + ΔPc = 3.5 kPa + 20 kPa = 23.5 kPaTo make sure the Nexus Valve Passim valve will keep the required differential pressure (ΔPc + ΔPbv) [kPa] constant within the circuit at flow 0.4 l/s, the product data sheets must be consulted.

SettingkPa

Min. flowl/h

Max. flowl/h

20 89 1790

22 94 1880

24 98 1960

26 102 2040

28 106 2120

30 110 2190

Extract from the Nexus Valve Passim DN 25 sizing table.

At a setting of 24 kPa, the available flow range is 98-1960 l/h and the design flow of 1440 l/h is within the range.Articles used:Nexus Valve Passim DN 25, 20-40 kPa, Article No. N80597.526Nexus Valve Fluctus with drain DN 25 S, Article No. N80597.537

68

6. Sizing examples

6.1.2 System with Nexus Valve Passim and Nexus Valve Vertex

A Nexus Valve Passim and a Nexus Valve Vertex are in this example sized to the following conditions:The designed branch flow controlled by the Nexus Valve Passim valve is 0.15 l/s (540 l/h).The available system differential pressure (ΔPa) is 35 kPa.The required branch differential pressure (ΔPc) is 15 kPa.The system has radiators with pre-settable thermostatic radiator valves installed. The flow can therefore be adjusted on the thermostatic radiator valves and the Nexus Valve Vertex can be installed outside the circuit controlled by the Nexus Valve Passim. Pressure loss across the Nexus Valve Vertex is not taken into account when setting the Nexus Valve Passim. The Nexus Valve Vertex must be in a fully open position.

ΔPa = ΔPBV

+ ΔPc + ΔPPASSIM

ΔPPASSIM

ΔPa ΔPc

ΔPBV

Δ Pa - available differential pressure in the systemΔ Pc - differential pressure required for the branchΔ Pbv - pressure loss across Nexus Valve VertexΔ PPassim - pressure loss across Nexus Valve Passim


0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45

0 180 360 540 720 900 1080 1260 1440 1620


35

30

25

20

15

10

5

0

bar0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00 Flowl/sl/h

Graph forNexus Valve Passim DN 20.

Three valves (in fully open position) can provide required flow of 0.15 l/s:Nexus Valve Passim DN 15 ΔPpassim = 11.5 kPaNexus Valve Passim DN 20 ΔPpassim = 4.5 kPaNexus Valve Passim DN 25 ΔPpassim = 2.0 kPa

69

The suitable Nexus Valve Vertex partner valve is selected based on the flow diagrams in chapter 3.2. It is recommended to use valves in fully open position at the required flow to reduce the pump head and save energy:

Nexus Valve Vertex DN 15 ΔPbv = 10.0 kPa (see chapter 3.2 - 14)Nexus Valve Vertex DN 20 ΔPbv = 1.5 kPa (see chapter 3.2 - 20)Nexus Valve Vertex DN 25 ΔPbv = 1.0 kPa (see chapter 3.2 - 26)

Pressure drop across valve PositionkPa250

100

10

7

3

1

bar2.5

1.0

0.1

0.07

0.03

0.01Flow

l/sl/h

9.99.08.07.06.05.0

4.0

3.02.01.00.0

0.0153 0.7 0.1 0.2 0.25 0.325

55 252 360 720 900 1170

Graph forNexus Valve Vertex DN 20.

The minimum required ΔPa for each valve set is calculated as follows: ΔPa = ΔPbv + ΔPc + ΔPpassim

DN 15 Min. ΔPa = 10.0 kPa + 15.0 kPa + 11.5 kPa = 36.5 kPaDN 20 Min. ΔPa = 1.5 kPa + 15.0 kPa + 4.5 kPa = 21.0 kPaDN 25 Min. ΔPa = 0.5 kPa + 15.0 kPa + 2.0 kPa = 17.5 kPaTo ensure the best functionality of the Nexus Valve Passim, the smallest possible valve is selected. However, the DN 15solution requires minimum ΔPa of 36.5 kPa to operate properly, and the system provides a ΔPa of only 35 kPa.Therefore the DN 20 valve is selected with an 5-25 kPa actuator.The correct ΔP setting on the Nexus Valve Passim valve is: ΔPc = 15.0 kPaTo make sure the Nexus Valve Passim valve will keep the required differential pressure ΔPc [kPa] constant within the circuit at flow 0.15 l/s, the product data sheets must be consulted.

SettingkPa

Min. flowl/h

Max. flowl/h

12 43 866

13 45 901

14 47 935

15 48 968

16 50 1000

Extract from theNexus Valve Passim DN 20sizing table.

At a setting of 15 kPa, the available flow range is 48-968 l/h and the design flow of 540 l/h is within the range.Articles used: Nexus Valve Passim DN 20, 5-25 kPa, Article No. N80597.523Nexus Valve Vertex with drain DN 20 Article No. N80597.707

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6. Sizing examples

6.2 DN 65-80

6.2.1 System with Nexus Valve Passim and Nexus Valve Fluctus

A Nexus Valve Passim and a Nexus Valve Fluctus partner valve are sized to the following conditions:

The designed branch flow controlled by the Nexus Valve Passim is 5.0 l/s (18000 l/h).The available system differential pressure ΔPa) is 60 kPa.The required branch differential pressure controlled by the Nexus Valve Passim (ΔPc) is 40 kPa.

0xDN 0xDN

0 x DN5 x DN

ΔPbv

ΔPpassim

ΔPcΔPa

ΔPa = ΔPbv + ΔPc + ΔPpassim

Δ Pa - available differential pressure in the systemΔ Pc - differential pressure required for the circuitΔ Pbv - pressure loss across partner valve (Nexus Valve Fluctus)Δ PPassim - pressure loss across the Nexus Valve Passim


0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

0 3600 7200 10800 14400 18000 21600 25200 28800 32400 36000 39600 43200 46800 50400 54000 57600 61200 64800 68400


120

110

100

90

80

70

60

50

40

30

20

10

0

bar1.30

1.20

1.10

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

0.10

0.0 Flowl/sl/h

Graph forNexus Valve Passim DN 65.

Two valves (in fully open position) can provide the required flow of 5.0 l/s:Nexus Valve Passim DN 65 ΔPpassim = 10 kPaNexus Valve Passim DN 80 ΔPpassim = 5 kPa

71

The suitable Nexus Valve Fluctus partner valves are selected based on the flow diagrams in chapter 3.1. It is recom-mended that the valve setting at the required flow is as close to the fully open position as possible. This enables the valve to operate at the required authority, and any valve setting change will result in a high pressure loss for precise flow adjustment:Nexus Valve Fluctus DN 65, ΔPbv = 5.3 kPa valve fully open (see chapter 3.1 - 59)Nexus Valve Fluctus DN 80, ΔPbv = 4.0 kPa valve in position 3.5 (see chapter 3.1 - 61))

Flowl/s

m3/h

Pressure drop across valve Position

1.8 2 3 4 5 6 7

6.48 7.2 10.8 14.4 18.0 21.6 25.2

kPa100

504030

20

10

543

bar1.0

0.50.40.3

0.2

0.1

0.050.040.03

9.0

3.0

7.0

6.0

5.04.0

10.0

8.0

Graph forNexus Valve Fluctus DN 65.

The minimum required ΔPa for each valve set is calculated as follows:ΔPa = ΔPbv + ΔPc + ΔPpassim

DN 65 Min. ΔPa = 5.3 kPa + 40 kPa + 10 kPa = 55.3 kPaDN 80 Min. ΔPa = 4.0 kPa + 40 kPa + 5 kPa = 49.0 kPaTo ensure the best functionality of the Nexus Valve Passim, the smallest possible valve is selected. Therefore the DN 65 valve is selected with an actuator 20-80 kPa.The correct ΔP setting on the Nexus Valve Passim valve is: ΔPbv + ΔPc = 5.3 kPa + 40 kPa = 45.3 kPaTo make sure the Nexus Valve Passim valve will keep the required differential pressure (ΔPc + ΔPbv) [kPa] constant within the circuit at flow Q [l/s], the product data sheets must be consulted. At the setting of 46 kPa, the available flow range is 1570 l/h to 39340 l/h and the design flow of 18000 l/h is within the range.

20-80 kPa

SettingkPa

Min. flowl/h

Max. flowl/h

38 1430 35750

40 1470 36680

42 1500 37590

44 1540 38470

46 1570 39340

Extract of the table forNexus Valve Passim DN 65.

Ordering: Nexus Valve Passim DN 65, Article No.: N80597.602,Nexus Valve Fluctus DN 65, Article No.: N80597.471,Combi Drain Maxi for capillary tube connection, Article No.: N80597.0204

72

6. Sizing examples

6.3 General specifications DN 15-50

1. Differential pressure control valve DN 15 - 501.1. The Contractor must install differential pressure control valves where indicated in drawings.

2. Function2.1. The valve must be used to provide constant differential pressure in the controlled circuit.2.2. Differential pressure setting must be externally adjustable.2.3. The positioning of the valve with actuator must be possible in all directions (360° around the pipe axis).2.4. The valve must have no requirement for straight up- or downstream piping.

3. Valve Body3.1. The valve body must be made of hot stamped DR brass CW602N CuZn36Pb2As or of cast iron EN-GJL-250 (GG25).3.2. The pressure rating must be no less than PN25 (PN16).3.3. The valve must comprise differential pressure control, isolation and draining in one single unit.3.4. A flow arrow must be indicated in the valve body.3.5. The actuator and drain valve must be positioned perpendicular to each other.3.6. Pressure testing must be possible in all directions (360° around the pipe axis) after installing a test point cap on the drain valve.

4. Actuator4.1. The housing of the actuator must be made of DR brass CW602N CuZn36Pb2As or of cast iron EN-GJL-250 (GG25).4.2. The actuator must incorporate a handle for valve isolation.4.3. The actuator must enable differential pressure setting using an Allen key.4.4. Twenty 360° rotations of an Allen key must ensure the full differential pressure setting range.

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6.4 General specifications DN 65-100

1. Differential pressure control valve DN 65 - 801.1. The Contractor must install the differential pressure control valve where indicated in drawings.

2. Function2.1. The valve must be used to provide constant differential pressure in the controlled circuit.2.2. Differential pressure setting must be externally adjustable.2.3. The positioning of the valve with actuator must be possible in all directions (360° around the pipe axis) at a temperature range up to 120°C.2.4. The valve must have no requirement for straight up- or downstream piping.

3. Valve Body3.1. The valve body must be made of cast iron EN-GJS-400-15.3.2. The pressure rating must be no less than PN16.3.3. The valve must be installed in the supply or in the return line.3.4. A flow arrow must be indicated on the valve body.

4. Actuator4.1. The actuator housing must be made of cast iron.4.2. The actuator must incorporate a knob for differential pressure setting.4.3. The differential pressure setting scale must be marked on the actuator.4.4. The edge of the regulating knob must indicate the differential pressure setting.4.5. Actuators with different setting ranges must be interchangeable.

74

Notes

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Documents

Differential Pressure Control Valve Passim · (DPCV) DN 15 - 50 1/2 - 2” Nexus Valve Passim Differential Pressure Control Valve (DPCV) DN 65 - 80 2½ - 3” 2.1 Description DN 15-80